Eric probably has the surname of his father. However his mother (ma'aaam) also uses Cartman as her surname. Let's say, she decided to keep that surname but in the episode where they go to Nebraska to visit Eric's grandparents, it was said "Welcome to Cartman family" to Stan, Kyle and Kenny. So how can they have it as a surname? Or actually does Eric have his surname from his mother's side?

That depends: is his mom using her maiden name? We used to think she was his father, so she'd be using "Cartman" as her last name no matter what, but now that Mitch Connor has told us it was all a cover-up, we don't know if she ever married the father, and thus, if "Cartman" is her married name or maiden one.

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